<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>Document</title>
  <!-- 导入页面的基本样式 -->
  <link rel="stylesheet" href="./css/search.css" />
  <!-- 导入 jQuery -->
  <script src="./lib/jquery.js"></script>
  <script src="./lib/template-web.js"></script>
</head>

<body>
  <div class="container">
    <!-- Logo -->
    <img src="./images/taobao_logo.png" alt="" class="logo" />

    <div class="box">
      <!-- tab 栏 -->
      <div class="tabs">
        <div class="tab-active">宝贝</div>
        <div>店铺</div>
      </div>
      <!-- 搜索区域（搜索框和搜索按钮） -->
      <div class="search-box">
        <input id="ipt" type="text" class="ipt" placeholder="请输入要搜索的内容" /><button class="btnSearch">
          搜索
        </button>
      </div>
      <!-- 搜索建议列表 -->
      <div id="suggest-list"></div>
    </div>
  </div>


  <script type="text/html" id="tpl-suggestList">
    {{each result}}
    <!-- 搜索建议项 -->
    <div class="suggest-item">{{$value[0]}}</div>
    {{/each}}
  </script>


  <script>
    $(function () {
      //1.定义延时器的id
      var timer = null;

      var cacheObj = {};

      //2.定义防抖的函数
      function debounceSearch(kw) {
        timer = setTimeout(function () {
          getSuggestList(kw);
        }, 500);
      }

    })
    $(function () {
      //为输入框绑定keyup事件
      $('#ipt').on('keyup', function () {
        //3.清空timer
        clearTimeout(timer);
        var keywords = $(this).val().trim();
        if (keywords <= 0) {
          return $('#suggest-list').empty().hide();
        }

        //先判断缓存是是否有数据
        if (cacheObj[keywords]) {
          return getSuggestList(cacheObj[keywords]);
        }

        //tooo:获取搜索建议列表
        // console.log(keywords); 
        // getSuggestList(keywords);
        debounceSearch(keywords);
      });


      function getSuggestList(kw) {
        $.ajax({
          url: 'https://suggest.taobao.com/sug?q=' + kw,
          dataType: 'jsonp',
          success: function (res) {
            console.log(res);
            renderSuggestList(res);
          }
        });
      }

      //渲染UI结构
      function renderSuggestList(res) {
        if (res.result.length <= 0) {
          return $('#suggest-list').empty().hide();
        }
        var htmlStr = template('tpl-suggestList', res);
        $('#suggest-list').html(htmlStr).show();


        //1.获取到用户输入的内容，当做键
        var k = $('#ipt').val().trim();
        cacheObj[k] = res;
        //2.需要将数据作为值，进行缓存
      }
    })
  </script>
</body>

</html>